BBC
Bbc History: Wars and Conflict: From the Field Gun to the Tank
Introduction to a series of pages that traces the development of the tank during WWI. Includes pictures and well-written analysis. A great place to find information on weapons used in WWI.
World War 1
Worldwar1.com: Trenches on the Web: Armory: Artillery
Data covering the types of standard and heavy field artillery used by both sides in World War I.
First World War
Tank Battle World War 1
A first-hand account of the first tank versus tank battle in World War 1 which occurred in April 1918.